import bcrypt from 'bcrypt';
import crypto from 'crypto';
import { prisma } from './db.js';
import { withBypassRLS } from './rls.js';

const SALT_ROUNDS = 12;
const SESSION_DURATION_MS = 30 * 24 * 60 * 60 * 1000; // 30 days

export async function hashPassword(password: string): Promise<string> {
	return bcrypt.hash(password, SALT_ROUNDS);
}

export async function verifyPassword(password: string, hash: string): Promise<boolean> {
	return bcrypt.compare(password, hash);
}

export async function createSession(userId: string): Promise<{ id: string; expiresAt: Date }> {
	const expiresAt = new Date(Date.now() + SESSION_DURATION_MS);
	const session = await prisma.session.create({
		data: { userId, expiresAt }
	});
	return { id: session.id, expiresAt };
}

export async function validateSession(sessionId: string) {
	// Uses withBypassRLS because this joins to the users table (RLS-protected)
	// and runs before tenant context is established in hooks.server.ts.
	return withBypassRLS(async (tx) => {
		const session = await tx.session.findUnique({
			where: { id: sessionId },
			include: {
				user: {
					select: {
						id: true,
						email: true,
						name: true,
						globalRole: true,
						tenantRole: true,
						tenantId: true,
						avatarUrl: true
					}
				}
			}
		});

		if (!session) return null;

		if (session.expiresAt < new Date()) {
			await tx.session.delete({ where: { id: sessionId } });
			return null;
		}

		return session;
	});
}

export async function deleteSession(sessionId: string) {
	await prisma.session.delete({ where: { id: sessionId } }).catch(() => {});
}

export function sessionCookieName(): string {
	return 'session';
}

export function sessionCookieOptions(expiresAt: Date) {
	return {
		path: '/',
		httpOnly: true,
		sameSite: 'lax' as const,
		secure: !import.meta.env.DEV,
		expires: expiresAt
	};
}

// ─── API Keys ────────────────────────────────────────────────

export function hashApiKey(key: string): string {
	return crypto.createHash('sha256').update(key).digest('hex');
}

export function generateApiKey(): { key: string; prefix: string } {
	const key = `pnc_${crypto.randomBytes(32).toString('hex')}`;
	const prefix = key.slice(0, 12);
	return { key, prefix };
}

export async function validateApiKey(key: string) {
	const keyHash = hashApiKey(key);

	const apiKey = await prisma.apiKey.findUnique({
		where: { keyHash },
		include: {
			user: {
				select: {
					id: true,
					email: true,
					name: true,
					globalRole: true,
					tenantRole: true,
					tenantId: true,
					avatarUrl: true
				}
			}
		}
	});

	if (!apiKey) return null;

	// Update last used timestamp (fire and forget)
	prisma.apiKey.update({
		where: { id: apiKey.id },
		data: { lastUsedAt: new Date() }
	}).catch(() => {});

	return apiKey;
}